chore: update eslint to v10 and @ionic/eslint-config to v0.5.0

[ItsChaceD]

Description

The migrator now moves plugins to ESLint 10 and @ionic/eslint-config v1: bumps both dependencies, replaces the eslintConfig block with an eslint.config.cjs, and drops --ext ts from lint scripts since flat config ignores it. The repo itself moves to the same setup.

Flat config has no equivalent of .eslintignore, so the generated config carries the plugin's existing ignore entries over instead of imposing a fixed list. Without that, a plugin that excluded website/, docs/ or a nested package would silently start linting it — on one repo in the rollout that was 15 entries and a flood of new reports. Directory entries become **/name/** (or path/** when nested), file entries are kept as-is, and a leading dot is not mistaken for a file extension. Plugins with no .eslintignore get the previous defaults.

Any leftover .eslintrc* is also deleted, not just .eslintignore — ESLint 10 reads neither, so leaving one behind is dead config.

Change Type

• Fix
• Feature
• Refactor
• Breaking Change
• Documentation
• Other (CI, chores, etc.)

Rationale / Problems Fixed

https://outsystemsrd.atlassian.net/browse/RMET-4734

Platforms Affected

• Android
• iOS
• Web

Notes

Depends on @ionic/eslint-config@1.0.0 being published (lockfile update pending).